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The following code samples demonstrate several ways to set and manage variables with default values. Although these examples all perform the same task, they do it in slightly different ways. The first example is probably the easiest to read from a human perspective, but is likely the most verbose in terms of coding efficiency. The option you choose will depend on your motives. Many times I have used the first type of code because scripts I ve written need to be simple to read and support by others with varying

If your form bean requires dependencies to be injected by Spring s ApplicationContext, overriding Tip

InitialContext initCtx = null; try { Principal p = this.ctx.getCallerPrincipal(); String username = p.getName();

levels of shell-scripting skill. I may want to use the more terse code types if supportability is of less concern than efficiency is. The first code example checks to see if a variable (VAR) has been set. The -z (zero) test checks to see if the length of the string variable is zero. If it is, the code resets the value of the variable to a default value.

formBackingObject() provides the opportunity to request the bean from the BeanFactory. Of course, to avoid having to manually pull the bean using the getBean() method on the BeanFactory you can use

initCtx = new InitialContext(); System.out.println( "User Requesting Connection:" + username ); srcName = "java:comp/env/"+userName+"BookDataSource" ; System.out.println("User Requesting DataSource:"+srcName); return ( (javax.sql.DataSource) initCtx.lookup( srcName ) ).getConnection(); } catch(NamingException ne) { ne.printStackTrace(); throw new EJBException( ne ); } finally{ try{ if(initCtx != null) initCtx.close(); } catch(NamingException ne) { throw new EJBException(ne); } } //finally }//method }

The next example performs the same task but it is a bit more elegant because it is contained within a single line of code instead of being spread out over four. The same test is performed against the variable, but the && (logical AND) syntax executes the code that follows if the test evaluates as true.

Spring s support for method injection (refer to Pro Spring by Rob Harrop and Jan Machacek (Apress, 2005) for more information). In any case, don t restrict your form beans to simple POJOs as you may use Spring s dependency injection for your form beans quite easily.

The data source must be defined in the ejb-jar.xml deployment descriptor for each of the users. The name of the data source must correspond to that of the generated data source name. For this example, we created two data source references (for users guest and markw ). Listing 3.6 shows the partial XML descriptor file for this bean.

[ -z "$VAR" ] && VAR="some default"

At this point, the form bean instance has been obtained. The Controller now creates the DataBinder and calls the initBinder() callback method. As with the work flow for viewing the form, use this method to register any custom PropertyEditors you need during binding.

<ejb-jar> <enterprise-beans> <!-- =========[ UserSpecificDB Session Bean ]======== --> <session> <ejb-name>userSpecificDB</ejb-name> <home>userspecificdb.UserSpecificDBHome</home> <remote>userspecificdb.UserSpecificDB</remote> <ejb-class>userspecificdb.UserSpecificDBBean</ejb-class> <session-type>Stateless</session-type> <transaction-type>Container</transaction-type>

The next example is streamlined (by one character). The test syntax within the square brackets can determine if the variable is set without performing the -z, or zero-length, test. The test used in this example determines whether the variable has been set by using the logical NOT modifier (!). If the variable being tested does not have a value, the use of the test [ "$VAR" ] will evaluate as false since there was no value to be found. With the addition of the NOT modifier, the test will evaluate to true because the combination of two negatives (! and an unassigned variable) yields a positive outcome. The extra code, assigning the default value to the VAR variable following the AND operator (&&), is then executed as before.

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